Affiliate marketing:

This is the most profitable method to earn huge amount of money. There is so many Affiliate marketing networks in the world, for example Amazon, Click Bank etc. By joining there Affiliate marketing program you can earn huge amount of money by using Facebook, website, and YouTube. In this program you should have at least a website/blog or YouTube channel.

For me, Amazon is the best for Affiliate marketing. I'll definitely recommend you to use Amazon. But if you chose other programs then no problem.

There are so many YouTube videos about Affiliate marketing, you can watch some of them and then you can start earning.